General bacterial porin family. General bacterial porins are a family of proteins from the outer membranes of Gram-negative bacteria. The porins act as molecular filters for hydrophilic compounds.[1] They are responsible for the 'molecular sieve' properties of the outer membrane.
About the CFR. The Code of Federal Regulations (CFR) is an annual codification of the general and permanent rules published in the Federal Register by the executive departments and agencies of the Federal Government.
USC means United States Code; CFR means Code of Federal Regulations. These citations* are shorthand for the laws and regulations that explain in precise terms what is needed in order for the Federal government to do business. Each is a citation which refers to a particular section of the law or its implementing regulations.